*{
  margin: 0;padding: 0;list-style: none;box-sizing: border-box;
}
html,body,#root{
  width: 100%;height: 100%;
}
.box{
  width: 300px;height: 300px;
  border: 1px solid #7e7e7e;
  position: fixed;z-index: 9999;
  left: 50%;top: 50%;
  margin-left: -150px;margin-top: -150px;
  background: #fff;
}
.tops{
  width: 100%;
  display: flex;
}
.tops >div{
  width: 50%;
  padding: 10px 0;
  text-align: center;
}
.tops >.act{
  border-bottom: 2px solid #f27;
  color: #f27;
}